<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div{
            width:100px;
            height:100px;
            border:solid 10px red;
            padding:10px;
            /*box-sizing:content-box;*/
            box-sizing:border-box;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>
